Infertility is a growing concern in rapidly depopulating Japan. But it is often seen as a women's problem, even though both sexes can be to blame.

A Tokyo company is trying to change that by marketing a kit that allows men to check their semen quality easily and in the comfort of their home.

The kit, called Seem and to be released by Recruit Lifestyle Co. this month, comes with a microscopic lens that can be attached to a smartphone and a cup to collect semen. Users also need to download a free iPhone app to take a video of their sperm.